[LTP] [PATCH v2 2/2] tst_net.sh: Detect IPv6 disabled on interface via sysctl

[Cyril Hrubis]

Hi!
> IPv6 on interface can be also disabled by sysctl
> net.ipv6.conf.$iface.disable_ipv6=1. This is better to be checked:
> * for all interfaces before run (can be disabled even for netns
>   interface previously created).
> * before ip addr command tries to work with IPv6 (in tst_init_iface()
>   and tst_add_ipaddr(), other functions should run these before)
> 
> Signed-off-by: Petr Vorel <pvorel@suse.cz>
> ---
>  testcases/lib/tst_net.sh | 46 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
> 
> diff --git a/testcases/lib/tst_net.sh b/testcases/lib/tst_net.sh
> index 96eed50793..f414dd9359 100644
> --- a/testcases/lib/tst_net.sh
> +++ b/testcases/lib/tst_net.sh
> @@ -121,6 +121,47 @@ tst_net_detect_ipv6()
>  	TST_NET_IPV6_ENABLED=1
>  }
>  
> +# Detect IPv6 disabled on interface via sysctl
> +# net.ipv6.conf.$iface.disable_ipv6=1.
> +# $TST_NET_IPV6_ENABLED: 1 on IPv6 enabled, 0 on IPv6 disabled.
> +# return: 0 on IPv6 enabled, 1 on IPv6 disabled.
> +tst_net_detect_ipv6_iface()
> +{
> +	[ "$TST_NET_IPV6_ENABLED" = 1 ] || return 1
> +
> +	local iface="$1"
> +	local type="${2:-lhost}"
> +	local check="sysctl -n net.ipv6.conf.$iface.disable_ipv6"

Here as well.

> +	local disabled
> +
> +	if [ "$type" = "lhost" ]; then
> +		disabled=$($check)
> +	else
> +		disabled=$(tst_rhost_run -c "$check")
> +	fi
> +	if [ $disabled = 1 ]; then
> +		tst_res_ TINFO "IPv6 disabled on $type on $iface"
> +		TST_NET_IPV6_ENABLED=0
> +		return 1
> +	fi
> +
> +	return 0
> +}
> +
> +# Detect IPv6 disabled on used interfaces.
> +tst_net_check_ifaces_ipv6()
> +{
> +	local iface
> +
> +	for iface in $(tst_get_ifaces); do
> +		tst_net_detect_ipv6_iface || return
                                          ^
					  $iface
> +	done
> +
> +	for iface in $(tst_get_ifaces rhost); do
> +		tst_net_detect_ipv6_iface $iface rhost || return
> +	done
> +}
> +
>  tst_net_require_ipv6()
>  {
>  	[ "$TST_NET_IPV6_ENABLED" = 1 ] || tst_brk_ TCONF "IPv6 disabled"
> @@ -531,7 +572,9 @@ tst_init_iface()
>  	local type="${1:-lhost}"
>  	local link_num="${2:-0}"
>  	local iface="$(tst_iface $type $link_num)"
> +
>  	tst_res_ TINFO "initialize '$type' '$iface' interface"
> +	tst_net_detect_ipv6_iface $iface $type
>  
>  	if [ "$type" = "lhost" ]; then
>  		if ip xfrm state 1>/dev/null 2>&1; then
> @@ -591,6 +634,8 @@ tst_add_ipaddr()
>  	local link_num="${2:-0}"
>  	local iface=$(tst_iface $type $link_num)
>  
> +	tst_net_detect_ipv6_iface $iface $type
> +
>  	if [ "$TST_IPV6" ]; then
>  		dad="nodad"
>  		[ "$type" = "lhost" ] && mask=$IPV6_LPREFIX || mask=$IPV6_RPREFIX
> @@ -1005,6 +1050,7 @@ tst_net_setup_network()
>  		$IPV4_RHOST/$IPV4_RPREFIX || echo "exit $?")
>  
>  	if [ "$TST_NET_IPV6_ENABLED" = 1 ]; then
> +		tst_net_check_ifaces_ipv6
>  		eval $(tst_net_iface_prefix $IPV6_LHOST || echo "exit $?")
>  		eval $(tst_rhost_run -c 'tst_net_iface_prefix -r '$IPV6_RHOST \
>  			|| echo "exit $?")
> -- 
> 2.39.1
> 

-- 
Cyril Hrubis
chrubis@suse.cz